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Spatial and sex differences in mercury contamination of skuas in the Southern Ocean
2022
Mills, William, | Ibañez, Andrés, | Bustamante, Paco | Carneiro, Ana, | Bearhop, Stuart | Cherel, Yves | Mariano-Jelicich, Rocío | Mcgill, Rona, | Montalti, Diego | Votier, Stephen, | Phillips, Richard,
Antarctic marine ecosystems are often considered to be pristine environments, yet wildlife in the polar regions may still be exposed to high levels of environmental contaminants. Here, we measured total mercury (THg) concentrations in blood samples from adult brown skuas Stercorarius antarcticus lonnbergi (n = 82) from three breeding colonies south of the Antarctic Polar Front in the Southern Ocean (southwest Atlantic region): (i) Bahía Esperanza/Hope Bay, Antarctic Peninsula; (ii) Signy Island, South Orkney Islands; and, (iii) Bird Island, South Georgia. Blood THg concentrations increased from the Antarctic Peninsula towards the Antarctic Polar Front, such that Hg contamination was lowest at Bahía Esperanza/Hope Bay (mean ± SD, 0.95 ± 0.45 µg g-1 dw), intermediate at Signy Island (3.42 ± 2.29 µg g-1 dw) and highest at Bird Island (4.47 ± 1.10 µg g-1 dw). Blood THg concentrations also showed a weak positive correlation with δ15N values, likely reflecting the biomagnification process. Males had higher Hg burdens than females, which may reflect deposition of Hg into eggs by females or potentially differences in their trophic ecology. These data provide important insights into intraspecific variation in contamination and the geographic transfer of Hg to seabirds in the Southern Ocean.
Afficher plus [+] Moins [-]Exposure of zebrafish to an environmental mixture of persistent organic pollutants triggers an increase in anxiety-like syndrome but does not affect boldness in unexposed offspring
2023
Alfonso, Sébastien | Blanc, Mélanie | Cousin, Xavier | Bégout, Marie-Laure | MARine Biodiversity Exploitation and Conservation [Sète] (UMR MARBEC SETE) ; Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM) | Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | COISPA Technologia y Ricerca ; Partenaires INRAE
International audience | Polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants (POPs) that are present as complex mixtures in all environmental compartments, including aquatic ecosystems. However, little is known about the effects of such complex mixtures on teleost behaviour. In this study, zebrafish (Danio rerio) were chronically exposed to an environmentally relevant mixture (MIX) containing 22 PCB and 7 PBDE congeners through diet from 5 days post fertilization onwards. MIX-exposed F0 fish produced offspring (F1 and F2 generations) that were fed using plain food and grown until adulthood. In each generation, five behavioural traits (i.e. boldness, activity, sociality, exploration and anxiety) were evaluated by the mean of different experimental set-ups. Two distinct behavioural syndromes were identified: boldness, positively correlated to activity and exploration; and anxiety, associated with low sociality. F0 fish did not display any behavioural disruption resulting from POP exposure whereas F1 MIX fish were bolder than fish from other generations but did not differ significantly from F1 controls. F2 MIX fish displayed a higher anxiety syndrome than F2 controls. This is of particular importance since such behavioural changes in offspring generations may have persistent ecological consequences, may affect fitness and hence cause detrimental effects on wild fish populations exposed to POP mixtures.
Afficher plus [+] Moins [-]Exposure of zebrafish to an environmental mixture of persistent organic pollutants triggers an increase in anxiety-like syndrome but does not affect boldness in unexposed offspring
2023
Alfonso, Sébastien | Blanc, Mélanie | Cousin, Xavier | Bégout, Marie-Laure | MARine Biodiversity Exploitation and Conservation - MARBEC (UMR MARBEC ) ; Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM) | Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | COISPA Technologia y Ricerca ; Partenaires INRAE
International audience | Polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants (POPs) that are present as complex mixtures in all environmental compartments, including aquatic ecosystems. However, little is known about the effects of such complex mixtures on teleost behaviour. In this study, zebrafish (Danio rerio) were chronically exposed to an environmentally relevant mixture (MIX) containing 22 PCB and 7 PBDE congeners through diet from 5 days post fertilization onwards. MIX-exposed F0 fish produced offspring (F1 and F2 generations) that were fed using plain food and grown until adulthood. In each generation, five behavioural traits (i.e. boldness, activity, sociality, exploration and anxiety) were evaluated by the mean of different experimental set-ups. Two distinct behavioural syndromes were identified: boldness, positively correlated to activity and exploration; and anxiety, associated with low sociality. F0 fish did not display any behavioural disruption resulting from POP exposure whereas F1 MIX fish were bolder than fish from other generations but did not differ significantly from F1 controls. F2 MIX fish displayed a higher anxiety syndrome than F2 controls. This is of particular importance since such behavioural changes in offspring generations may have persistent ecological consequences, may affect fitness and hence cause detrimental effects on wild fish populations exposed to POP mixtures.
Afficher plus [+] Moins [-]Clams, Ruditapes decussatus L., as a pollution bioindicator. Zinc and lead accumulation and depuration
1995
Castro, L. (Universite Nouvelle de Lisbonne (Portugal)) | Carmo, C. | Peres, I.
Mercury transfer (Hg) localization using bryophytic bioindicators as describers of the hydrological functioning (river - groundwater exchange) in the plain of the upper Rhine in Alsace (France) [principal component analysis, multiple correspondence factor analysis]
1995
Roeck, U. (Universite de Strasbourg 1, Illkirch Graffenstaden (France). Departement Hydrologie et Environnement) | Glasser, N. | Tremolieres, M.
Cytochrome P4501A and other enzymes as molecular biomarkers for use in pollution monitoring
1995
Livingstone, D.R. (National Environment Research Council, Plymouth (Royaume Uni). Plymouth Marine Laboratory)
Biochemical assessment of cellular energy allocation in Daphnia magna exposed to toxic stress as an alternative to the conventionnal "Scope for growth" methodology
1995
De Coen, W.M. (University of Ghent (Belgique). Laboratory of Biological Research in Aquatic Pollution) | Janssen, C.R. | Persoone, G.
Measurement of MFO [mixed function oxidase] levels in roach as a biomarker of PAH [polycyclic aromatic hydrocarbons] levels in freshwater systems in UK
1995
O'Hare, D.B. (University of Derby (Royaume Uni). School of Environmental and Applied Sciences, Department of Biology) | Siddall, R. | Gill, R.A. | Robotham, P.W.J.